Migration to create table raises Mysql2::Error: Table doesn't exist

Question

I wrote a migration with the following:

class CreateTableSomeTable < ActiveRecord::Migration[5.1]
  def change
    create_table :some_tables do |t|
               


        

Answer 1

The big issue with the ActiveRecord migration 5.1 is that now the id are expected to be BIGINT instead of INT, so when you adding a column referring another table created before rails 5.1 it expect the column type to be BIGINT but instead is just an INT, hence the error. The best solution is just modify your migration and change the type of the column to int.

class CreateTableSomeTable < ActiveRecord::Migration[5.1]
 def change
  create_table :some_tables do |t|
   t.references :user, foreign_key: true, type: :int
   t.references :author, references: :user, foreign_key: true
   t.text :summary
  end
end

that should work.